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(3cos2y ; y)
Author:
Sin Min
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
平行線的判定
盈利與虧蝕
圓的基本性質
龙形曲线-分形龙2
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直角三角形斜边上的中线
Rectangle_04
Circumcentre
spinral
畫等腰直角三角形 題3
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Trigonometry
Difference and Slope
Division
Differential Calculus
Derivative